Compilare: main.cpp: In function 'int f(int)': main.cpp:11:19: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare] 11 | for(int i=1; i<=n; ++i) | ~^~~ main.cpp: In function 'int main()': main.cpp:28:19: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare] 28 | for(int i=1; i<=n; ++i) cin>>v[i] ; | ~^~~